[#3536] added ChangeLog entry

ChangeLog

@@ -1,3 +1,13 @@
+2289. [func]* razvan
+ Renamed the 'libdhcp_mysql_cb.so' hook library to
+ 'libdhcp_mysql.so' and the 'libdhcp_pgsql_cb.so' hook library to
+ 'libdhcp_pgsql.so' and merged the lease and host backends for
+ the respective database types in the same libraries. The hook
+ libraries are now required when using either MySQL or PostgreSQL
+ lease or host databases and must be added to the
+ 'hooks-libraries' list.
+ (Gitlab #3536)
+
 2288. [bug] marcin
  Prevent the clients from declining expired or released leases.
  Only a valid lease assigned to the declining client can now